The utility model discloses an infrared imager minimum detectable temperature difference tries on clothes from dynamic testing and puts, the device is including the optic platform, temperature controlmodule, blackbody origin module, target wheel module, difference blackbody origin temperature controller, collimator and the computer that are used for bearing all equipment, optic platform bears allother modules, the temperature control module control environment temperature, the blackbody origin module is passed through target wheel module and is formed specific space frequency and shape infrared, through the parallel infrared beam of collimator formation, is surveyed by infrared imager and gathers, difference blackbody origin temperature controller is used for controlling the blackbody origin temperature, the precise rotating platform bears infrared imager for precise adjustment infrared imager's imaging distance and angle, the computer is used for controlling the automatic operationof other modules to it handles to carry out data analysis, the influence of human factor to the test can be avoided to the device.